package com.nais.interceptor;

import java.text.DateFormat;
import java.util.Date;
import java.util.List;
import java.util.Locale;
import java.util.Properties;

import org.apache.ibatis.executor.Executor;
import org.apache.ibatis.mapping.BoundSql;
import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.mapping.ParameterMapping;
import org.apache.ibatis.plugin.Interceptor;
import org.apache.ibatis.plugin.Intercepts;
import org.apache.ibatis.plugin.Invocation;
import org.apache.ibatis.plugin.Plugin;
import org.apache.ibatis.plugin.Signature;
import org.apache.ibatis.reflection.MetaObject;
import org.apache.ibatis.session.Configuration;
import org.apache.ibatis.session.ResultHandler;
import org.apache.ibatis.session.RowBounds;
import org.apache.ibatis.type.TypeHandlerRegistry;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.nais.helper.WarnHelper;



/**
 * ���ݿ�������
 * 
 **/
@Intercepts({
		@Signature(type = Executor.class, method = "update", args = { MappedStatement.class, Object.class }),
		@Signature(type = Executor.class, method = "query", args = { MappedStatement.class, Object.class,
				RowBounds.class, ResultHandler.class }) })
public class MybatisInterceptor implements Interceptor {

	private static final String DAO_STR = ".dao.";
	
	/**
	 * sql retry count
	 */
	private static final int SQL_RETRY_COUNT = 3;
	
	/**
	 * LOGGER
	 */
	private static final Logger LOGGER = LoggerFactory.getLogger(MybatisInterceptor.class);

	public Object intercept(Invocation invocation) throws Throwable {
		StringBuffer buf = new StringBuffer("[SQL] ");
		try {

			Object parameter = null;
			if (invocation.getArgs() != null && invocation.getArgs().length > 1) {
				parameter = invocation.getArgs()[1];
				MappedStatement mappedStatement = (MappedStatement) invocation.getArgs()[0];
				BoundSql boundSql = mappedStatement.getBoundSql(parameter);

				Configuration configuration = mappedStatement.getConfiguration();

				String sqlId = mappedStatement.getId();

				String sql = getSql(configuration, boundSql, sqlId);
				buf.append(sql == null ? "":sql);
			}
		} catch (Exception e) {
			LOGGER.error(WarnHelper.generatorLog() + "gen sql Exception," + e.getMessage(), e.fillInStackTrace());
		}
		Object returnValue = null;
		for(int i=0;i<SQL_RETRY_COUNT;i++) {
			try {
				long start = System.currentTimeMillis();
				returnValue = invocation.proceed();
				long end = System.currentTimeMillis();
				long time = (end - start);
				buf.append(" [costs :").append(time).append("ms]");
				break;
			} catch(Exception e) {
				LOGGER.error(WarnHelper.generatorLog() + "exec sql Exception," + e.getMessage(), e.fillInStackTrace());
				if(i == SQL_RETRY_COUNT-1) {
					buf.append(" return value : [" + returnValue + "]");
					LOGGER.info(buf.toString());
					throw e;
				}
				Thread.sleep(500L);
			}
		}
		
		buf.append(" return value[" + returnValue + "]");
		LOGGER.info(buf.toString());
		return returnValue;
	}

	public static String getSql(Configuration configuration, BoundSql boundSql, String sqlId) {
		String sql = showSql(configuration, boundSql);
		StringBuilder str = new StringBuilder(100);
		// dao֮ǰ·����*����
		int indexOfDao = sqlId.indexOf(DAO_STR);
		if (indexOfDao > 0) {
			sqlId = "*." + sqlId.substring(indexOfDao + DAO_STR.length());
		}
		str.append(sqlId);
		str.append(":");
		str.append(sql);
		return str.toString();
	}

	private static String getParameterValue(Object obj) {
		String value = null;
		if (obj instanceof String) {
			value = "'" + obj.toString() + "'";
		} else if (obj instanceof Date) {
			DateFormat formatter = DateFormat.getDateTimeInstance(DateFormat.DEFAULT, DateFormat.DEFAULT, Locale.CHINA);
			value = "'" + formatter.format((Date) obj) + "'";
		} else {
			if (obj != null) {
				value = obj.toString();
			} else {
				value = "";
			}

		}
		return value;
	}

	public static String showSql(Configuration configuration, BoundSql boundSql) {
		Object parameterObject = boundSql.getParameterObject();
		List<ParameterMapping> parameterMappings = boundSql.getParameterMappings();
		String sql = boundSql.getSql().replaceAll("[\\s]+", " ");
		if (parameterMappings.size() > 0 && parameterObject != null) {
			TypeHandlerRegistry typeHandlerRegistry = configuration.getTypeHandlerRegistry();
			if (typeHandlerRegistry.hasTypeHandler(parameterObject.getClass())) {
				sql = sql.replaceFirst("\\?", getParameterValue(parameterObject));

			} else {
				MetaObject metaObject = configuration.newMetaObject(parameterObject);
				for (ParameterMapping parameterMapping : parameterMappings) {
					String propertyName = parameterMapping.getProperty();
					if (metaObject.hasGetter(propertyName)) {
						Object obj = metaObject.getValue(propertyName);
						sql = sql.replaceFirst("\\?", getParameterValue(obj));
					} else if (boundSql.hasAdditionalParameter(propertyName)) {
						Object obj = boundSql.getAdditionalParameter(propertyName);
						sql = sql.replaceFirst("\\?", getParameterValue(obj));
					}
				}
			}
		}
		return sql;
	}

	public Object plugin(Object target) {
		return Plugin.wrap(target, this);
	}

	public void setProperties(Properties properties) {
		// TODO Auto-generated method stub
	}
}
